ARG ALPINE_TAG=3.23.0

FROM alpine:"${ALPINE_TAG}" AS jre-build

ARG JAVA_VERSION=17.0.17_10

SHELL ["/bin/ash", "-o", "pipefail", "-c"]

COPY jdk-download-url.sh /usr/bin/jdk-download-url.sh
COPY jdk-download.sh /usr/bin/jdk-download.sh

RUN apk add --no-cache \
    ca-certificates \
    jq \
    curl \
    && rm -fr /var/cache/apk/* \
    && /usr/bin/jdk-download.sh alpine

ENV PATH="/opt/jdk-${JAVA_VERSION}/bin:${PATH}"

# Generate smaller java runtime without unneeded files
# for now we include the full module path to maintain compatibility
# while still saving space (approx 200mb from the full distribution)
RUN case "$(jlink --version 2>&1)" in \
      "17."*) set -- "--compress=2" ;; \
      # the compression argument is different for JDK21
      "21."*) set -- "--compress=zip-6" ;; \
      *) echo "ERROR: unmanaged jlink version pattern" && exit 1 ;; \
    esac; \
    jlink \
      --strip-java-debug-attributes \
      "$1" \
      --add-modules ALL-MODULE-PATH \
      --no-man-pages \
      --no-header-files \
      --output /javaruntime

FROM alpine:"${ALPINE_TAG}" AS controller

RUN apk add --no-cache \
    bash \
    coreutils \
    curl \
    git \
    git-lfs \
    gnupg \
    musl-locales \
    musl-locales-lang \
    openssh-client \
    tini \
    ttf-dejavu \
    tzdata \
    unzip \
  && git lfs install

ENV LANG=C.UTF-8

ARG TARGETARCH
ARG COMMIT_SHA

ARG user=jenkins
ARG group=jenkins
ARG uid=1000
ARG gid=1000
ARG http_port=8080
ARG agent_port=50000
ARG JENKINS_HOME=/var/jenkins_home
ARG REF=/usr/share/jenkins/ref

ENV JENKINS_HOME=$JENKINS_HOME
ENV JENKINS_SLAVE_AGENT_PORT=${agent_port}
ENV REF=$REF

# Jenkins is run with user `jenkins`, uid = 1000
# If you bind mount a volume from the host or a data container,
# ensure you use the same uid
RUN mkdir -p $JENKINS_HOME \
  && chown ${uid}:${gid} $JENKINS_HOME \
  && addgroup -g ${gid} ${group} \
  && adduser -h "$JENKINS_HOME" -u ${uid} -G ${group} -s /bin/bash -D ${user}

# Jenkins home directory is a volume, so configuration and build history
# can be persisted and survive image upgrades
VOLUME $JENKINS_HOME

# $REF (defaults to `/usr/share/jenkins/ref/`) contains all reference configuration we want
# to set on a fresh new installation. Use it to bundle additional plugins
# or config file with your custom jenkins Docker image.
RUN mkdir -p ${REF}/init.groovy.d

# jenkins version being bundled in this docker image
ARG JENKINS_VERSION
ENV JENKINS_VERSION=${JENKINS_VERSION:-2.504}

# jenkins.war checksum, download will be validated using it
ARG WAR_SHA=efc91d6be8d79dd078e7f930fc4a5f135602d0822a5efe9091808fdd74607d32

# Can be used to customize where jenkins.war get downloaded from
ARG WAR_URL=https://get.jenkins.io/war/${JENKINS_VERSION}/jenkins.war

# could use ADD but this one does not check Last-Modified header neither does it allow to control checksum
# see https://github.com/docker/docker/issues/8331
RUN curl -fsSL ${WAR_URL} -o /usr/share/jenkins/jenkins.war \
  && echo "${WAR_SHA}  /usr/share/jenkins/jenkins.war" >/tmp/war_sha \
  && sha256sum -c --strict /tmp/war_sha \
  && rm -f /tmp/war_sha

ENV JENKINS_UC=https://updates.jenkins.io
ENV JENKINS_UC_EXPERIMENTAL=https://updates.jenkins.io/experimental
ENV JENKINS_INCREMENTALS_REPO_MIRROR=https://repo.jenkins-ci.org/incrementals
RUN chown -R ${user} "$JENKINS_HOME" "$REF"

ARG PLUGIN_CLI_VERSION=2.13.2
ARG PLUGIN_CLI_URL=https://github.com/jenkinsci/plugin-installation-manager-tool/releases/download/${PLUGIN_CLI_VERSION}/jenkins-plugin-manager-${PLUGIN_CLI_VERSION}.jar
RUN curl -fsSL ${PLUGIN_CLI_URL} -o /opt/jenkins-plugin-manager.jar \
  && echo "$(curl -fsSL "${PLUGIN_CLI_URL}.sha256")  /opt/jenkins-plugin-manager.jar" >/tmp/war_sha \
  && sha256sum -c --strict /tmp/war_sha \
  && rm -f /tmp/war_sha

# for main web interface:
EXPOSE ${http_port}

# will be used by attached agents:
EXPOSE ${agent_port}

ENV COPY_REFERENCE_FILE_LOG=$JENKINS_HOME/copy_reference_file.log

ENV JAVA_HOME=/opt/java/openjdk
ENV PATH="${JAVA_HOME}/bin:${PATH}"
COPY --from=jre-build /javaruntime $JAVA_HOME

USER ${user}

COPY jenkins-support /usr/local/bin/jenkins-support
COPY jenkins.sh /usr/local/bin/jenkins.sh
COPY jenkins-plugin-cli.sh /bin/jenkins-plugin-cli

ENTRYPOINT ["/sbin/tini", "--", "/usr/local/bin/jenkins.sh"]

# metadata labels
LABEL \
    org.opencontainers.image.vendor="Jenkins project" \
    org.opencontainers.image.title="Official Jenkins Docker image" \
    org.opencontainers.image.description="The Jenkins Continuous Integration and Delivery server" \
    org.opencontainers.image.version="${JENKINS_VERSION}" \
    org.opencontainers.image.url="https://www.jenkins.io/" \
    org.opencontainers.image.source="https://github.com/jenkinsci/docker" \
    org.opencontainers.image.revision="${COMMIT_SHA}" \
    org.opencontainers.image.licenses="MIT"
